Mechanical brake.



D. G. SGHULTZ.

MECHANICAL BRAKE.

APPLIoATIoN FILED FEB.5,1907.

D. C. SCHULTZ.

MEGHANIGAL BRAKE. APPLICATION FILED H115, 1907.

Patented Feb. 16, 1909.

2 SHEETS-SHEET 2.

WIr/@$5155 K V/NT R UNiTED y sTATus .PATENT vorrucn.

DA-VID CHARLES SGHULTZ, OF ALLIANCE., OHIO, ASSIGNOR TO THE MORGANENGINEERING COMPANY, GF ALLIANCE, OHIO. i

MECHANICAL BRAKE.

vSpecification of Letters Patent.

Patented Feb. 1e, 1909.

To all whom 'it concern:

Be it known that I, DAVID CHARLES SonULTz, of Alliance, in the county ofStark and State of Ohio, have invented certain new and usefulImprovements in Mechanical Brakes; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to an improvement in mechanical brakes designedmore particularly for the hoisting mechanism of overhead travelingcranes, and it consists in the parts and combinations of arts as will bemore fully described and pointed out in the claims. ,t

In the accompanying drawings, Figure 1 is a View partly in section andpartly in elevation of my improved brake and Fig. 2 is a view in sideelevation of same.

1 represents a driving shaftvadapted to be mounted in suitable bearingsand coupled up to a source of power. In overhead travf cling cranes,this shaft would be geared up the armature shaft of a motor and drivethe hoisting drum, and for the purpose of illustrating the operation ofthe brake or clutch, I will describe it as applied to the hoisting'mechanism of an overhead traveling crane.

This shaft 1 is provided with the screw threaded section 2 to which theadjusting nut 3 is clamped. This nut is split as shown in Fig. 1, itssplit ends being clamped by the bolt 4 which operates to lock the nut,to the shaft.

, Sleeve 5 is keyedv to shaft 1 adjacent to the split nut 3, and bearsat its end against the latter and is provided near its inner end withthe friction disk 6, and at its inner end with a tooth or projectingsection 7 which latter lies in the path of a similar tooth or projection8 on the sleeve 9. These teeth 7 and 9 are sufficiently far apart topermit a limited rotary movement of each sleeve independently of theother, but prevents either sleeve from making a complete rotationindependently of the other.

Sleeve 9 is provided internally with threads-10, meshing with threads 11on shaft l, and near its inner end with the friction disk 12, the twodisks 6 and 12 being alike as to size and shape and are provided withstraight parallel inner faces which rest in contact with the frictionblocks or rings 13 located on opposite sides of the inwardly projectingfriction ring 14. This ring 14 is integral with the circularA rim 15which latter is bolted to the side sections 16 and 17, the said rim andsidesections constituting a casing for the friction devices. Thissection 16 of the casing has a cylindrical end 16 which is snuglymounted on the sleeve 5,

while the section 17. has a similar cylindrical,

end 17:t mounted on the sleeve 9.

IVith the casing in position as shown it will be seen that the severalfriction disks and interposed friction ring and blocks, are inclosed bythe casing thus permitting the latterto be partly filled with oil,whereby the moving parts including the internal threads on the sleeve 9and the threads 11 on shaft 1, may be thoroughly lubricated.

The rim 15 of the casing is provided with a. peripheral groove in whichthe ieXible brake strap 1S of any approved construction, rests. Thisstrap is connected at its ends to the pivoted` lever 19,.the latterbeing so constructed that when the shaft 1 and the casing are turning ina direction to wind up the hoist chain,.the brake band willbe moved in adirection to loosen up on the casing and permit the latter to be freelyrevolved, but when the shaft is rotating in a direction to unwind thehoist chain,the brake band will be forced into contact with the rim ofthe casing and lock the latter against movement.

Mounted on shaft 1 adjacent to the outer end of sleeve 9 is the pinion20, which latter is provided with a dovetailed slot adapted lto receivea similarly shaped projection 21 on the. sleeve 9; the sleeve and pinionare thus locked together before being placed upon the shaft l, and whenthe parts are assembled as shown in Fig. 1 they will necessarily rotatein unison. By making the pinion separate from the sleeve, instead ofintegral as heretofore, it will not be necessary to replace the sleeveshould the teeth on the pinion break or wear down. j

The pinion is in engagement with a pinion on the hoist drum, or in meshwith a `train of gear for actuating the hoist drum,

and when shaft 1 is rotated in a direction to wind up on the hoist rope,motion is transmitted thereto through the brake or clutch mechanism asfollows: As shaft'1 is rotated, sleeve 5 which is keyed thereto is alsoposif tively rotated. The weight or load on sleeve 9 tends however tohold the friction disk of the latter out of contact with the coperatingfriction surfaces but this tendency is overcome by the teeth 11 on shaft1 moving against teeth 10 on sleeve 9, which operates to force sleeve 9toward sleeve 5 thus firmly clamping the blocks 13 against the oppositesides of the friction ring 14, andi causing all the parts to rotate inunison Without any interference from the brake strap. It will now beseen that with the friction disks in Contact with the friction blocksand the latter with the friction ring on the casing, that a continuedrotary motion of shaft 1 in a direction to hoist will be communicated tothe hoisting drum through the sleeve 9 and pinion 20.\ It Will also beseen that when there is a load suspended from the hoisting drum, theweight of said load tends to turn the sleeve 9 on the screw and applythe friction brake, hence in hoisting the sleeves are locked to androtate with shaft 1.

lTo lower the load, the direction of rotation of the motor and shaft 1are reversed, andas a retrograde movement of the easing is prevented bythe brake as previously explained, this reverse movement of the shafttends to separate the sleeves 5 and 9 and thus relieve the frictionbetween the friction devices. As soon as the friction is relieved, the

sleeve 9 which sustains the load will begin` tate in a direction tolower the load, and

these movements are continued until the load has been deposited. iththis construction it will be seen that in hoisting the friction surfacesare always in contact, and all the parts are locked to shaft 1, so as torotate continuously therewith. In lowering the rotation ofthe shafttends to and does move the sleeve 9 longitudinally of the shaftV thusseparating the clutching surfaces, but as the weight of the load is onsleeve 9, this weight tends to turn the sleeve faster than the shaft,which unequal movement as before explained, moves the Isleeve on theshaft toward the fixed sleeve 5' and again applies the friction. `Thesemovements of the sleeve 9 are in rapid succession and practicallycontinuous and therefore hardly noticeable to the eye.

Oil may be introduced into the casing through a bore 23 in shaft 1 or itmay be admitted through thehole in the casing closed by plug 24:.

' By the term integral employed in the claim, I do not intend to limitmyself to friction disks or rings cast integral with the parts, but Iintend the term to cover disks and rings fixed to the sleeves and casingrespectively so that the said parts positively 4 of parts herein shownand described with.

out departing from the spirit and scope of my invention hence I wouldhave it understood that I do not wish to conline myself to the exactconstruction and arrangement of i parts shown and described,vbut,

fully described my invention what I claim as new and desire to secure byHaving Letters-Patent, issp 1. The combination with a shaft havin ascrew threaded section, of a threade sleeve mounted thereon and providedwithan integral friction disk, a sleeve fixed to said shaft and providedwith an integral friction disk, a casing inclosing said dlsks andprovided with an integral inwardly projecting friction ring, the latterbeing located between the friction disks, a pinion fixed to the threadedsleeve and means for preventing the casing from rotating inv onedirection. l 2. The combination with a shaft havin a screw threadedsection, of a threade sleeve mounted on said threaded section andprovided with an integral friction disk, a`

sleeve, and means for preventing said casing. from rotating in onedirection. A

3. The combination with a shaft having section of the shaft and providedwith an y'105 cated between said disks, a pinion mounted? on the' shaftand connected to the threaded.

. a screw threaded section, of an internally" threaded sleeve mounted onthe threadedintegral friction disk, a sleeve keyed to the shaft andprovidedk with an integral friction disk, a lubricant containing cas'5.-;1'1 mounted on said sleeves and provided wit an integral internalfriction ring located between the friction disks on the sleeves,

friction blocks interposed between said disks and ring, a pinion coupledup tothe internally threaded sleeve, and means forl preventing saidcasing from rotating in` one direction.

4. rlhe combination with a shaft having a screw threaded section, of aninterna threaded sleeve mounted on the threa' ed' section of the shaftand provided'with an integral friction disk, a sleeve fixed to saidshaft and provided with an integral friction disk, a lubricantcontaining casing mounted on said sleeves and inclosing the disks andprovided with an integral inwardly projecting friction ring, means forlocking said casing against rotation in one direction and a piniondetachably connected with the threaded sleeve. v

5. The combination with a shaft having a screw threaded section, of an.internally threaded sleeve mounted on said threaded section landprovided with an integral friction disk, a sleeve fixed to said shaftand provided with an integral friction disk, a casing inclosing thedisksand provided with an integral inwardly projecting friction ring,friction blocks interposed between said friction disks and ring, apinion detachably connected with the threaded sleeve, and

`specification 1n the presence of two subscribing witnesses.

DAVID CHARLES SCHULTZ.

Witnesses:

N. C. FETTERS, DELIJA REBmLoT.

